Helen Dahlke, Daniel R. Fuka, Zachary M. Easton Tammo S. Steenhuis
description
Transcript of Helen Dahlke, Daniel R. Fuka, Zachary M. Easton Tammo S. Steenhuis
Development of an internet-accessible tool for the identification of hydrologically sensitive areas (HSA’s) and the calculation of New York State
phosphorous indicesHelen Dahlke, Daniel R. Fuka, Zachary M. Easton
Tammo S. Steenhuis
Introduction
• hydrologically sensitive areas (HSA‘s) are preferred flowpath in the landscapes of the humid Northeast of the US
• connect mostly agricultural land to streams and lakes
• need of estimation of the risk of nutrient loads in surface waters: CNMP planner help producer to identify high risk transport areas when applying manure
• current tools use a fixed distance setting from a watercourse and/or soil wetness indicators
• need of tools that consider the landscape position of saturation areas and their spatial-temporal dynamics
• tool must be user-friendly and easy accessible
study areas Salmon Creek: 227 km² (87.7 mi²)
Fall Creek: 326 km² (126 mi²)
Six Mile Creek: 102 km² (39 mi²)
model approach
rainfall ETIf rainfall > ET,
soil wets upIf rainfall > soil storage,
excess overland flow
• flowaccumulation• slope• soil depth• soil hydraulic
conductivity
SPPQe
e
2
DEM
DK
a
s
tanln
Soil topographic wetness index
• Calculation of the fractional area of the watershed prone to saturation
terr
ain
anal
ysis
hydr
olog
y
Google Earth-based HSA-tool
• Google Earth (http://earth.google.com) is free software that provides a virtual globe program
• it maps earth by superimposition of satellite images, aerial phorographs and GIS maps over a 3D globe
• user can program their own data overlays of vector or raster data using the Keyhole Markup Language (KML)
• maps can be animated based on a time stemp ideal for time series application such as simple hydrological models
realization of the HSA-tool in Google Earth
Soil topographic wetness index [Geo-Tiff]
Soil topographic wetness index [GRID]
• reclassification into 255 classes of equal area• export into Geo-Tiff
HSAimage [png]
modelled fractional area of HSA‘s [table]
• conversion to web-image
*.png file• 1% incremental area
images KML-file for Google Earth
realization of the HSA-tool in Google Earthcontrol bar for timeseries simulation
loaded images of HSA‘s for each day of simulation
Six Mile Creek
realization of the HSA-tool in Google Earth
daily estimated level of phosphorous load is displayd at the outlet of the catchment
http://vsa-hydro.cornell.drfuka.org/townbrook/1998.kml
http://vsa-hydro.cornell.drfuka.org/sixmile/1998-05.kml
http://128.253.239.23/Website/Imagetest/viewer.htm